Apparatus for forming molds for casting metal pipe



T i STAT PATENT M-OFFICE;

JAOOBK. DIMMIGK, OF- NEWPORT, KENTUCKY.

APPARATUS FOR FoRMmc oLos FOR C sTlNc Er L RIPE. A

SPECIFICATION forming art d nette Paeensm. 317,101; dated 5, 1885.

Application mea May 28, was (No model.) i

To all wh am) it may concern.-

Be it known that I, JACOB KLDIMMICK a citizen of the United States, residing at Newport, in the county of Campbell and State of Kentucky, .have invented certain new and useful Improvements in Apparatus for Forming Pipe-Molds, of which the following is a specification. 1

My invention consists in'combining, with a .frameor flask for molding a former of such shape that its withdrawal packs the moldsand tightly, accessory mechanism which permits the sand to be filledin the top of the flask before the former is started, and thereafter guides and directs said former whileallowing it a continuous uninterrupted motion through and exit from said flask and from the com-; pleted mold, and in such further specific combinations as are hereinafter set A forth and claimed.

The accompanying drawing is a vertical section of apparatus embodying and adapted to the carrying out of my invention.

A represents the flask, which may be the same as heretofore patented by met0 wit: in Letters Patent No. 253,854, granted 011 the 21st day of February, 1882-or of any other construction usual in this class of work.

B, C, D, and E are the four sections or reaches of the former, either rigidly secured together or integral with each other; F, a guide ring or sleeve centered in place by the bell-pattern G,which has an axial bore for the purpose, of diameter very slightly exceeding the external diameter of said ring, the latter being prevented from falling 'throngh the pattern and to the bottom of the flask by a peripheral flange about its crown, but otherwise retained in place by its own weight.

H is the upper plate, which is clamped to the flask at I, and has shoulders J countersunk in the bell-pattern to hold the latter rigidl yin place and prevent wabbling, but is centrally apertured for the passage of the guidering when the latter is lifted from its seat.

The upper reach or section, B, of the former has an external diameter just sufficiently less than the internal diameter of the guide-ring, through which it passes, to allow it to slide freely therein. The next lower reach or section, 0, increases regularly indiameter until at its foot it is substantially the same as the external diameter of the guide-ring. The third reach orsection should haveaspacebetweeu it and. the walls of thecentralor axialbore through the bell-pattern, averaging an eighth of an inch to the entire diameter of said bore, and the last reach orsection,.E, is intended to fit into an opening in the bottom of theflask for. the purpose of centering and steadying the former. l

It will be seen that the. former is thus retained in position by the guide-ring and the opening orzseat at the bottom of the flask. The. smaller reach or sectionof the former gages the amount of sand received in themold,

while the flaring head measures the interior -size of the mold, and by its longitudinalmovement through the flask, when being withdrawn, packs the sand. The amount of flare to the head of the former determines the closeness with which the mold is packed.

I make the smaller section of the former of A such size relative to the larger section and the flask l as will secure the compression of the sand practically one-third its bulk-that is, the space left for sand around the larger part of the former is about two-thirds that around the smaller part. This may be varied according to the compression required i-nthe mold and the character of sand used, but the proportion given is approximately the best.

The mode ,of forming the moldsiis as follows: When the flask and theformer are in position, as shown in the drawing, sufiicient sand is placed in the flask to fill it, when prop: erly rammed slightly above the upper end of the flaring section 0 of the former, or, say, ten inches in a twelve-foot mold, proportioning it in such manner that the unrammed sand will be properly compacted in the subsequent operations. This sand, thus placed, is rammed in the ordinary way. The remainder of the flask is then filled with sand, without rammin g, up to the neck of the bell'mouth, or to the top, a seat for the bell-mouth pattern bein g in the latter case roughly shaped by hand. The bell-mouth is placed in position andsand filled in and rammed about it, and the top plate put on and locked by keys or cotters.

Then, thenecessary power being applied at the ring a, which is strongly secured to the upper section, B, of the former, or in any other convenient manner, the former is withdrawn from the flask, sliding through the sleeve or guidering, which remains in place until the reach or section 0 comes in contact with it and controls the movement of the former in a path parallel with the walls of the mold to be made. When the section 0 reaches the guide-ring, it lifts said ring up through the central bore of the bell-pattern in which it has been seated. Continuing the withdrawing of the former, the lower reach or section, D;next enters this central bore and passes through. Now, as the surface of the reach 0 is equally pressed upon by the mold-sand at every point and tapers upward, drawing this section upward compresses tightly together the particlesof the sand and renders the-surface of the mold smoother, and packs it more uniformly than can be done by any ramming of the mold-sand about the former by hand or by machine-such hand or machine ramming unavoidably compressing the mold-sand in some places more than in others, thus leaving the surface of the mold uneven and liable to expand unequally when exposed to the heat and pressure of the cast, and liable to the formation of blow-holes. By the time the portion 0 reaches and lifts the guide-ring the mold has been formed for the most of its length. As the guide-ring rises (still keeping the former perpendicular) it is itself prevented from wabbling by the interior walls of the bell-pattern, and the distance from the lower end of the guide-ring in its original position to the upper extremity of the bell-pattern being greater than the length of the section 0, it will be seen that section D will have entered the central bore of the pattern before the guide-ring leaves it, thus entirely obviating any irregular movement from side to side. 1

- It is obvious that other modes of guiding the former or. of withdrawing the compressor-hea'd may be adopted without departing from the essential features of my invention. For instance, the head of the former withdrawn.

measure the interior dimensions of the mold and its tapering face to compress .the sand when it is withdrawn, while the smaller section of the former determines by its relative size the amount of sand to be introduced and the degree of compression to be given it, and a gravitating or equivalently removable guidering centered in the axial bore of the bell-pattern is employed, the leading features of -my invention will be more or less perfectly employed.

I claim as my invention- 1. The combination substantially as described, with a movable former constructed with a first section or length of uniform diameter, a second section gradually increasing in diameter, and a third section of diameteruniform with the greatest diameter of the preceding, of a bell-pattern having a central bore of such diameter as to permit the passage of the entire former loosely, and a guide fitting into said bore and acting to center and direct the lesser section of the former with respect to the bell-pattern until the larger section enters the bore thereof.

2. The combination, substantially as described,with a flask and compressing-former, having substantially the outline set forth, which former is capable of being drawn upward through said flask to pack and coma bell-pattern having an axial bore in which the guide-ring is centered and restrained from lateral motion, and through which it can pass when raised by the flaring section of the former.

4. The combination of the flask A, the enlarging former, the guide-ring F, the bell-pattern G, and the clamping-plate H, as and for the purpose set forth. JACOB K. DIMMICK.

WVitnesses:

FRANK W. BURNHAM, \VILLI'AM S. SOHMAL. 

